Refactor buck external dependencies

Change-Id: Ia4b99493407eb7d4e893804cba6b944f758f085e
diff --git a/providers/openflow/meter/BUCK b/providers/openflow/meter/BUCK
index a2e289d..0e94809 100644
--- a/providers/openflow/meter/BUCK
+++ b/providers/openflow/meter/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//lib:NETTY',
     '//lib:openflowj',
     '//protocols/openflow/api:onos-protocols-openflow-api',
 ]